virulent

• adj.

• 猛毒な、有毒な。毒気を含む、悪意に満ちた、憎しみに燃えた。毒々しい、どぢつい、苛酷な。(医)悪性の。(菌)毒性の

Fukuda says this particular strain of swine flu could become more or less virulent over time.

関

pathogenesis、pathogenetic、pathogenic、pathogenicity、toxic、toxicity、virulence